[MacPorts] #39777: Updated swi-prolog portfile for version 6.4.0

[MacPorts]

#39777: Updated swi-prolog portfile for version 6.4.0
-------------------------+---------------------------------
  Reporter:  pmoura@…    |      Owner:  larryv@…
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  haspatch maintainer
      Port:  swi-prolog  |
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Changes (by larryv@…):

 * owner:  macports-tickets@… => larryv@…
 * status:  new => assigned
 * version:  2.1.3 =>


Comment:

 Thanks. In the future, please keep functional changes and whitespace
 changes in separate patchfiles.

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Ticket URL: <https://trac.macports.org/ticket/39777#comment:1>
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